Two Munich train stations were evacuated late Thursday after German authorities received information from foreign intelligence agencies that five to seven Islamic State militants were planning co-ordinated attacks in the city.

A German security official, speaking on condition of anonymity because he wasn’t authorized to divulge the information publicly, said the key tip came from French authorities shortly before 8 p.m. (1900 GMT) local time.

Munich police spokesman Sven Mueller said descriptions of the alleged attackers included several “common Arab names” but that they could be false.

He said up to 200 additional officers are patrolling the streets Saturday to spot any suspicious activity and reassure the population.

WATCH: Police in Munich warned of a “serious, imminent threat” by Islamic State group suicide bombers wanting to commit a terror attack on New Year’s Eve.